如何对列表中所有共享特定属性的项目求和? [英] How to sum a set of items in a list that all share a specific property?

问题描述

我有一个对象列表.每个对象都有一组变量/属性.这些由多个十进制数和状态的字符串表示形式组成.如何将状态相同的对象列表中的每个金额相加?

I have a list of objects. Each object has a set of variables/properties. These consist of multiple decimal amounts and a string representation of a state. How would I sum each amount in the list of objects that has the same state?

我知道我可以执行 Model.ReportList.Sum(x => x.Amount)来获取整个列表中所有Amount变量的总和.我想做同样的事情，但是只求和每个都具有的 x 的 Amount 变量，例如， x.State ="GA" .

I know I can do Model.ReportList.Sum(x => x.Amount) to get the sum of all Amount variables across the whole list. I want to do the same thing but only sum the Amount variables of each x that all have, for example, x.State = "GA".

推荐答案

使用 GroupBy 可能是一个很好的答案，但是如果您只在乎，那就太过分了汇总一个州的金额.如果这是您所需要的(如您的问题所提示)，请使用 Where 扩展名:

Using GroupBy may be a good answer, but it's overkill if you only care about summing amounts for one state. If that's what you need (as your question suggests), use Where extension instead:

Model.ReportList.Where(x => x.State == "GA").Sum(x => x.Amount);

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